import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author 吴阳基
 * @datetime 2023/11/24 15:41
 */
public class Main {
    public static void main(String[] args) {
        new ReentrantLock();
        new ConcurrentHashMap<>();
        new HashMap<>();
        System.out.println(1 & 3);
        System.out.println(1 ^ 4);
        System.out.println(6 << 5);
        System.out.println(Math.round(-1.2));
        System.out.println(Math.round(-1.5));
        System.out.println(Math.round(1.5));
        System.out.println(Math.round(-1.6));
        System.out.println("Hello world!");
    }
}